Mia (pictured left with her dad) didn't speak until she was seven-years-old

The new show examines how autistic children and their families are treated around the world.

Speaking on the show he said: "One of the most important steps for a parent of a child with autism is to stop mourning the child that they thought they had and and start embracing the child that they have."

However the singer admitted it is not always easy to cope with the disability, he said: "Every day you have a realisation that you're going to have a child with a lifelong disability is absolutely horrifying.

"It's so frustrating, horrifying, upsetting. But you have to try and find the positive."

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In the documentary Keith reveals how she first began communicating with physical signals, after not speaking for the first seven years of her life.

He said: "She started to become more apart of our world in small ways, she would start to take you by the hand when she needed something and push your hand into whether it was in the direction of the cupboard or the fridge.

"That was brilliant because it meant that we were moving in the right direction."

Keith also urged other parents to embrace their child's disability, he said: "When they decide to do that, the world becomes a brighter place and every kind of success the child has becomes a celebration."

The singer says parents need to "find the positive" with their child's disability

The former Corrie actor also said an early diagnosis is important: "The earlier you can diagnose a child with autism the earlier you can put in place an intervention plan and I think that's fantastic. To make it 11 is an absolute disgrace.

"Every individual is important. And to leave an individual with a disability like autism to be un-intervened until the age of 11 is just wrong.

"You have to undo so many things to then put in place what needs to be done."